Messages in this thread | | | Subject | Re: [RFC][patch 0/2] mm: remove PageReserved | From | Benjamin Herrenschmidt <> | Date | Wed, 10 Aug 2005 11:27:24 +0200 |
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On Tue, 2005-08-09 at 20:41 +0100, Russell King wrote: > On Tue, Aug 09, 2005 at 07:38:52AM -0700, Martin J. Bligh wrote: > > pfn_valid() doesn't tell you it's RAM or not - it tells you whether you > > have a backing struct page for that address. Could be an IO mapped device, > > a small memory hole, whatever. > > The only things which have a struct page is RAM. Nothing else does.
Well, not anymore :)
With sparsemem, you can cheat now and have struct page for non-RAM, and this is actually useful. I want some IO space to be "context switchable" and thus map it with nopage() functionality, etc...
Ben.
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